Retard automation is a game about defending your planet with unmanned bots that are not too intelligent. In the game you can customize your bots to some extend, but they are not going to be perfect.
They said the fourth world war would be fought with sticks and stones. They were wrong, as it wasn't fought at all. You represent the last remnants of humankind, aboard an alien spaceship. Your duty is to find a new home for humankind.
Unfortunately, the ship was not meant for humans to manouver.
Nobody expects you to succeed.
Good luck.